Semi-passive radio frequency identification (RFID) tag with active beacon
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United States of America Patent
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Mar 25, 2008
Grant Date -
Nov 10, 2005
app pub date -
May 4, 2004
filing date -
May 4, 2004
priority date (Note) -
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Abstract
A radio frequency beacon device for use with a backscatter interrogator includes a processor; a receiver coupled to the processor; a backscatter modulator coupled to the processor; and an active transmitter coupled to the processor, the active transmitter being configured to transmit an RF signal, in response to a trigger signal, regardless of whether the interrogator is providing a carrier wave for backscatter modulation by the backscatter modulator. Other methods and apparatus are provided.
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